Acid dyestuffs of the anthraquinone series and a process of making same



Patented Aug. 8, 1950 *TUNITED STATES PATENT OFFICE ACID DYESTUFFS on THE ANTHRAQUINONE scams AND A raooessor MAKING SAME Samuel von Allmen and Hans Eggenberger, Basel,

Switzerland, assignors to Sandoz Limited, Basel,

Switzerland No Drawing. Application July 5, 1947, Serial No.

759,293. In Switzerland-July 5, 1946 jThe present invention relates to new dyestuffs ofthe anthraquinone series which give very bril- 8(Jlaims. (01. 2609-371) f liant shades and to a process for their manufacture. *'It has been found that new acid dyestuffs of the anthraquinone series can be prepared by condensing amino-anthraquinone compounds of the general formula wherein X stands for chlorine, bromine or a sulfonic-acid group, Y stands for chlorine or bromine, and one of the Zs stands for SOsH, the other Z being hydrogen, with hydroaromatic amines of the general formula l HIN- C H wherein R stands for hydrogen, alkyl or aralkyl 100" preferably in presence of copper or per-salts at catalyst and of diluting agents and,

in somecases, in aninert atmosphere. As diluting agents one can use an excess of the hydro,

aromatic amine itself or water or organic solvents, like methanol, ethanol or mixtures "hereof.

-The isolation of l the condensation products is,

carried out by the usual methods and presents no special difiiculties.

The new dyestuffs obtained according to this process possess, as compared to the known dyestufis described in U. S. Patent No. 1,821,043,-

much better levelling properties and better fastness to light, perspiration, washing and milling.

'The following examples, without being limitative, illustrate the present invention, the parts being by weight.

radicals andwhen two Rs stand in adjacent positions to each other, they may represent a rin closing butylor butylene group, the other R being hydrogen. In the case where X stands for chlorine or bromine, this halogen atom will be replaced by a sulfonic acid group by treating the resultant intermediate condensation products with an alkali metal sulfite.

.As hydroaromatic amines that can be used ac.

cording to the present invention thefollowlngmay be cited: l-aminocyclohexane, l-amino-2-, -3- and] -monoalkylcyclohexane, ,l-amino-Z 3- dialkylcyclohexane, 1 amino-2:4-dialkylcyclohexane, I l-amino-Z 5-dialkylcyclohexane, leamino- 2 :G-dialkylcyclohexane, 1 -amino-3 4-dialkylcy- 1' clohexane, l-amino-B :5-dialky1cyclohexane, 1- amino-2 3 :4-trialkylcyclohexane, l-amino-Z 3 :5- trialkylcyclohexane, l-amino-2-: 3 G-trialkylcyclohexane, 1-amino-2 :4 5-trialkylcyclohexane, 1-

amino-2:4:G-trialkylcyclohexane,1-amino-3 :4 5-

trialkylcyclohexane, wherein "alky stands for methyl or ethyl groups; further l-amino-3- methyl 4 benzyl cyclohexane, 1 amino 3 methyl-5-benzylcyclohexane, 1-amino-3t4- or 3 z fi-dibenzylcyclohexane, l-aminoor Z-aminotetraor -decahydronaphthalene and so on.

Thecondensation of the anthraquinone com: pounds with the hydroaromatic amines is car! ried out attemperatures ranging between 30; and

l and, wet-treatments.

dish-blue on addition of somepara-formalda' hyde. U l i This dyestuff dyes animal fibres, like wool, silk and. synthetical fibres, such as nylon, inbrilliant pure blue shades of good fastness tolight It. possesses good levelling properties. i l r The condensation can be carried out in an inert atmosphere and the quantities of the amine, alkali and water can be varied in wide limits.

A similar dyestuff will be obtained, when the potassium salt of 1 amino 4 bromanthra quinone -2E5-disulfonic acid is used.

Ercample 2 i 11 parts of the sodium salt of l-arnino-lchloranthraquinone-Z:5-disulfonic acid, 20 parts of 1-amino-4-methy1cyclohexane, 4 parts of caustic soda lye 30 per cent, 0.2 part of copper powder, 0.1 part of cuprous chloride and 80 parts of water are stirred in a nitrogen atmosphere for 16 hours at -'70 C.. After the reaction is finished, the dyestuff is isolated in the usual man,- nerand possesses similar properties to the dyestuff of Example 1. 1 l

cop-

Instead of the base used one can use l-amlnod-ethyl-cyclohexane or the respective isomers containing the methylor ethyl group in 2- or 3-position.

Example 3 By replacing in Example 1 the 6 parts of aminocyclohexane b 10 parts of 1-amino-224-diethylcyclohexane or its isomers or the respective dimethyl derivatives, similar dyestuffs possessing similar fastness properties will be obtained.

Example 4 10.4 parts of the potassium salt of l-amino- 2 :4 dibromanthraquinone 5 sulfonic acid, parts of l-amino-2:4:fi-trimethyleyclohexane, 4 parts of caustic soda lye 30 per cent, 0.3 part of copper powder and 120 parts of water are stirred in a nitrogen atmosphere for 24 hours at fill-70 C. After the reaction is finished, the dyestuff is isolated in the usual manner and the bromine atom present in 2-p0sition replaced by a sulfonic acid group by heating the condensation product with an alkali metal sulfite under pressure.

Instead of the amine used in this example its isomers can be employed, thus producing dyestuffs possessing similar fastness properties,

Example 5 12.5 parts of the potassium salt of l-amino- 4-bromanthraquinone-2:5-disulfonic acid containing 1.7 parts of sodium sulfate, 12 parts of 1- amino-3t i-dimethylcyclohexane, 4 parts of caustic soda lye 30 per cent, 0.2 part of copper powder, 20 parts of ethanol and 80 parts of water are stirred at 55-60 C., until the reaction mass becomes pure blue colored. The condensation prod- 4 properties to light and to wet treatment and possesses good levelling properties, The condensation can also be carried out in an, inert atmosphere.

. Similar dyestufis will be obtained, when the anthraquinone compound used above is replaced by its 2:8-disulfonic isomer, while instead of the amine used above the respective isomers or the ethyl derivatives are used.

Example 7 22.5 parts of the potassium salt of 1-amino-4- bromanthraquinone-2:S-disulfonic acid containing 1 part of sodium sulfate, 25 parts of 2-aminoin brilliant pure blue shades of good fastness to not thus obtained is isolated in the usual manner.

In dry state it is a blue powder being easily soluble in cold water with a brilliant greenish-blue shade. Its solution in concentrated sulfuric acid is nearly colorless, but becomes on addition of some para formaldehyde reddish-blue. The new dyestuff dyes animal fibres and nylon in brilliant pure blue shades of good fastness to light and to wet treatmerits and possesses good levelling properties. The condensation can also be carried out in an inert atmosphere.

Similar dyestuffs will be obtained when, instead of the amine used above, amines like l-amino- 3: S-dimethylcyclohexane, 1-amino-3 4-diethylcyclohexane, 1-amino-3 4-methylethylcyclohexane are used.

Instead of the anthraquinone compound used above its isomer, i. e. the 1-amino-d-bromanthra- Quinone-228-disulfonic acid, can be used, whereby dyestuffs possessing similar fastness properties will be obtained.

Example 6 1 2.5 parts of the potassium salt of l-amino-4- bromanthraquinone-Z:5-disulfonic acid containing 1.7 parts of sodium sulfate, 20 parts of 1- amino-3:4:5-trimethylcyclohexane, 4 parts of caustic soda lye 30 per cent, 0.2 part of copper powder, 20 parts of ethanol and 80 parts of water are stirred at 55-60 C. until the reaction mass becomes pure blue. The condensation product thus obtained is isolated in the usual manner. dry state it is a blue powder being easily soluble in cold water with a brilliant greenish-blue shade. Its solution in concentrated sulfuric acid is pale yellow, but becomes reddish-blue on addition of some parafor'maldehyde.

The new dyestuff dyes animal fibres and nylon in brilliant pure blue shades of good fastness light and to wet treatments and possesses good levelling properties.

Identical or similar dyestuffs will be obtained when the potassium salt of 1-amino-4-bromanthraquinone-Zz8-disulfcnic acid is replaced by another salt or by the free acid or by the isomer containing the sulfonic groups in 2:5-position.

Example 8 20 parts of the sodium salt of l-amino-bromanthraquinone-Z:5-disulfonic acid, 25 parts of 1- amino-l :2 3 l-tetrahydronaphthalene, 10 parts of caustic soda lye 30 percent and 240 parts of water are stirred at -70 C., until the color of The lated in the usual manner. In dry state it is a blue powder being easily soluble in cold water with a brilliant greenish-blue shade. Its solution in conc. sulfuric acid is colorless, but becomes reddish-blue on addition of some para-formaldehyde. The new dyestufi' dyes animal fibres and nylon in brilliant pure blue shades possessing good fastness to light and to wet treatments and possesses good levelling properties.

Instead of the amine used above one can use 1- or Z-amino-decahydronaphthalene, whereby dyestuffs possessing similar properties will be obtained.

The disulfonic acids used in the above examples can be replaced by'the 2:4-dihalogenomonosulfonic acids; in such cases it will be necessary,in order to prepare identical dyestuffs to subject the condensation products primary obtained. to a treatment with an alkali metal sulfite.

What we claim is:

1. A process for the manufacture of a new acid dyestuff of the anthraquinone series comprising the step of condensing l-amino-d-bromanthraquinone-2:8-disulfonic acid with aminoc'yclo hexane in presence of an acid binding agent, copper as catalyst and a diluent.

2. A process for the manufacture of anew acid dyestuif of the anthraquinone series comprising the. step of condensing l-amino--bromanthraquinone-Z:5 disulfonic acid with l-amino- 3: 4-dimethylcyc1ohexane in presence of an acid binding agent, copper as catalyst and a diluent.

3. A process for the manufacture of a new acid dyestuif of the anthraquinone series comprising the step of condensing 1-amino-4-bromanthraquinone-2:8-disulfonic acid with Z-amino- 1: 2:3:4-tetrahydronaphtha1ene in presence of an acid binding agent, copper as catalyst and a diluent.

4. The anthraquinone dyestufi of the formula CHr-CH:

CH: CHr-Ofi:

5. The anthraquinone dyestufi of the formula CHr-CHg (J/H CH-CH: CHr-C 6. The anthraquinone dyestuff of the formula CH: CH HN-C ofi \CH C 2 CH 7. A process for the manufacture of new acid dyestufis of the anthraquinone series comprising the step of condensing anthraquinone compounds of the general formula Z O NH:

6 wherein Y stands for a substituent selected from the group consisting of chlorine and bromine and wherein one of the Zs stands for a sulfonic acid group, the other Z being hydrogen, with hydroaromatic amines of the general formula wherein R stands for a member selected from the group consisting of hexahydrophenyl, hexahydrotolyl, hexahydroethylphenyl, hexahydroxylyl, hexahydrodiethylphenyl, hexahydrodimethylphenyl, hexahydrodiphenyl, hexahydrobenzylphenyl, ac-tetrahydronaphthyl and decahydronaphthyl, in presence of an acid binding agent, of copper as catalyst and of a diluent.

8. As new articles of manufacture the acid anthraquinone dyestuffs of the general formula Z NH:

NHR

wherein one of the Zs stands for a sulfonic acid group, the other Z being hydrogen and wherein R stands for a member selected from the group consisting of hexahydrophenyl, hexahydrotolyl, hexahydroethylphenyl, hexahydroxylyl, hexahydrodiethylphenyl, hexahydrodimethylphenyl, hexahydrodiphenyl, hexahydrobenzylphenyl, actetrahydronaphthyl and decahydronaphthyl.

SAMUEL VON ALLMEN. HANS EGGENBERGER.

REFERENCES CITED The following references are of record in the file of this patent: 

8. AS NEW ARTICLES OF MANUFACTURE THE ACID ANTHRAQUINONE DYESTUFFS OF THE GENERAL FORMULA 